WORMS. TESTACEA. 66. Oftrea. 275 



Born Muf. Cafi Vind. tefi. tab. 6. /. 9, 10. 

 Chemn. conch. 8. tab. 1$\fi$* 672, 673. 



3. Martin allg. Naturf. 4. tab. 48,/. 3, 4. 



4. Chemn. conch. 8. /*£. 71, /. 660 ? 



5. Chemn. conch. 8. tab. 71, /. 661. 



6. Cfe»». rwra&. 9. **£. 1 l6 > / 994—996. 



Inhabits European and J»<tf*ft feas, affixed to rocks or In large 

 beds : the fifti is well known as a palatable and nutritious 

 food : Jhell of various fizes, forms and colours, within white 

 and often gloffy like mother of pearl 1 the old (hells have often 

 an Anomia fixed to them,, and arc frequently covered with 

 Serpulse, Lepades, Sertulariaj and other marine productions. 



S$miaurata Shell oval, ilightly eared, fmooth, with an oblique bafe. 



Gualti test. tab. 84. fig. H. 



Schrast. einl. in conch. 3. tab* 6. fig?6> 



Inhabits the Mediterranean, about \\ inch long and \\ broad : 

 dirty olive with a few undulate white lines : very thin ; each 

 valve convex and ending in a beak j hinge with 5 rounded 

 hollows, 



* Striata. Shell oval with longitudinal filiform ridges: infide green. 



Donovans Britijh Jhells. ii. tab. 45. 



Da Cofta Brit, conch. tab % 1 1 , fig* 4. 



Lifter An. Ang. tab. 4. fig. 4, 



Gualt. conch, tab. \o% fig. B ? 



Inhabits European feas j about an inch in diameter. 



Shell thick, ftrong, nearly opake, not membranaceous as in the 

 common oyfter, with numerous {lender irregular ridges di- 

 vided towards the bottom : upper-waive flattifh, lower con- 

 cave: hinge broad, deep, fomewhat triangular and ftriate 

 tranfverfely. In many fhells is a white radiate mark below 

 the hinge, formed by the cartilage of the nm, 



lornkata.- Shell rough, oblong, linear, with divergent hinges vaulted 

 internally. 

 Chemn conch. 8. tab. 75. fig.66j. a, b. 



Inhabits the Red Sea, Shell brittle, membranaceous, tawny, 

 about as long as a finger, terminating at the hinge in an eloa* 

 gated acutangular beak. 



Sinenfis. Shell rough, lamellate, unequal and glabrous within : lower- 

 valve larger, concave and ending in a beak, with 10 

 obtufe plaits. 

 Chemn conch. 8. tab. 72, fig. 668. 



Inhabits Chinefe jhores ; 4 inches long and a little narrower: 

 faell riifiet-brown, within whitifh towards the hinge, 



M m 2 Spon- 



